Mac Pro and two new Apple LED Cinema Display 27" brightness control

Hi all,
Have been using my new Mac Pro (HD5770) with one 27" display for a while and am loving it and to make my work easier I got one more 27" display but how do I change the brightness on the second display? Only the first one can be changed and it's a big difference in the colors on the displays.
With Best Regards / Christian

Make sure you have the display update installed. Look for the ambient light sensor control in Displays system preference to see if it's installed.
<http://support.apple.com/kb/DL1107>
<http://support.apple.com/kb/HT4293>
Turn off mirroring.
Do you have brightness slider for both displays?
Try unplugging the USB cable for one display so you can adjust the brightness on the other.

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